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Quantum Key Agreement (QKA) signifies that two or more participants togethergenerate a key and QKA has to satisfy the following conditions: 1 Everyparticipant can change the key and the key is not decided by any participantindividually. 2 Only participants can know the key; nonparticipants cannot getthe key through illegal means. Because of the condition 1 of participatingtogether, it makes transport inefficient in the current mainstream protocols.They use unicast to exchange messages one by one, so it will considerably limittransmission efficiency and increase cost time spent. This study proposes aprotocol based on Multiparty Quantum Secret Direct Communication (MQSDC) withmulticast. In addition to satisfying the above conditions, it uses multicast tonot only achieve the effect and purpose of QKA, but also to defend againstinternal and external attacks at the same time. In regard to resourceconsumption, this study involves linear growth and is more efficient than othermainstream protocols which employ exponential growth.

Multiparty Quantum Key Agreement based on Quantum Secret Direct Communication with GHZ states